I bought an Edimax EW-7811UAC for my Pi3 because my Wi-Fi signal is bad at my bedroom.
Now the signal is amazing and I have no problem to connect to my 2.4GHz network, but the thing is that the adapter doesn’t found any 5GHz network (and I’ve tried with different configurations on my router, but nothing).
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I can see that it’s getting what seems to be the correct driver (8812au) and successfully connects to channel 6 (2437 MHz).
It might be worth installing CRDA at this point:
sudo apt-get update
sudo apt-get install crda
Then edit /etc/default/crda and set REGDOMAIN=ES. Save and reboot.
You need to be sure that 2.4 GHz and 5 GHz have different SSIDs. Then run
connmanctl
scan wifi
services
If that fails to see 5 GHz, try to connect through ethernet cable, reboot and repeat the wifi scan. You might also need to run enable wifi in this case.